table{
    width: 600px;
    border: 1px solid rgba(0,0,0,.5);
    border-radius: 5px;
    box-shadow: 5px 5px 15px #000;
    border-collapse: collapse;/*合并相邻边框*/
    overflow: hidden;
}
th,
td{
    padding: 5px;
    border: 1px solid rgba(0,0,0,.5);
}